JP2007285095A - Pc member and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fully fill concrete in joint clearance, in a PC member using a tapered tile having rear edge side on a butt end surface tapered. <P>SOLUTION: A plurality of tiles 2, 2, 2 are arranged on a bed 1 at a prescribed interval with their rear surfaces directed upward, a temporary joint material 4 is filled in between tiles 2, 2, and a highly flowable concrete 3 is casted from above, to integrate the concrete 3 to the tile 2, thereby obtaining a PC plate having the plurality of tiles 2, 2, 2 integrally stuck on the top surface of the concrete 3. Dovetail grooves 2d are provided on the rear surface of tiles 2 to projectingly form dovetail reverse feets 2a, 2a, 2a. The tapered surface 2b is formed on the rear edge side of the butt end surface of each tile 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a PC member and a method for manufacturing the same, and more particularly to a PC member having a taper surface on the rear edge side of a wooden end surface of a tile and a method for manufacturing the same.

  Conventionally, in the tile tipping method to obtain a concrete wall with multiple tiles integrated on the surface by placing concrete on the back of multiple tiles arranged in a flat shape, the concrete and tiles are securely attached. Therefore, ant legs are formed in a dovetail shape on the back surface of the tile. When placing concrete on the back side of multiple tiles and then applying concrete to vibrate and compacting it, if too much vibrator is applied, tiles roll up, bubbles are generated, and there is insufficient vibrator. In addition, there is a problem that the strength of the tile being integrated with the concrete may be insufficient due to shortage around the concrete of the back foot part.

  In view of this, the present applicant disclosed in Japanese Patent Laid-Open No. 10-245963 that concrete is placed on the back surface of a plurality of tiles arranged in a plane, and the plurality of tiles are integrally attached to the surface. In the tile tipping method for obtaining a body, a tile tipping method is proposed in which the side peripheral surface of each tile is formed in a tapered shape to prevent the tile from being pulled out from the concrete.

In this way, if a tapered end surface is formed on a part or the entire periphery of the side surface of each tile, the cast concrete will turn around to the surface side of the tapered end surface and firmly hold the tile. Thus, the tiles are firmly integrated with each other, and the sticking state of the tiles becomes extremely strong, making it difficult for the tiles to peel from the concrete. In addition, since the tile front edge side of the wood end surface is a vertical surface, even if nose from the concrete adheres, it is difficult to see from the front, and the aesthetics are also improved. However, there is a problem in that the tile trailing edge side of the end face of the wood has an outward taper, so that the concrete is not sufficiently filled and the tile peels off.
Japanese Patent Laid-Open No. 10-245963

  An object of the present invention is to make the joint gap sufficiently filled with concrete in the PC member using the tapered tile having a taper on the rear edge side of the wood end surface.

  The PC member according to claim 1 is a PC member in which a plurality of tiles are arranged with a gap between joints, and concrete is placed on the back side of the tile, and the tile has a trailing edge side facing toward the side. The taper surface bulges out, and the taper surface is embedded in highly fluid concrete.

  The PC member according to claim 2 is characterized in that, in claim 1, a back foot is provided on the back surface of the tile, and the depth of the back foot is shallower than the thickness of the portion forming the tapered surface. To do.

  According to a third aspect of the present invention, in the PC member according to any one of the first to third aspects, the taper angle of the tapered surface is 3 to 15 °.

  The method for producing a PC member according to claim 4 is a method for producing a PC member, comprising: arranging a plurality of tiles with a gap between joints, and placing concrete on a back side of the tile. The trailing edge side is a tapered surface projecting sideways, and the concrete is characterized by being highly fluid concrete.

  The method for producing a PC member according to claim 5 is characterized in that, in claim 4, the concrete has a slump height of 23 cm or more.

  The method for producing a PC member according to claim 6 is characterized in that, in claim 4 or 5, the water-cement ratio of the concrete is 40% or more.

  In the PC member of the present invention, since the high fluidity concrete is used as the concrete, the joint gap is sufficiently filled with the concrete. Thereby, the PC member in which the tile is firmly integrated with the concrete is obtained.

  Specifically, the high fluidity concrete preferably has a slump height of 23 cm or more.

  In this PC member, since the taper surface of the wood end surface is embedded in the concrete and excellent in integration between the concrete and the tile, the dovetail groove on the back surface of the tile may be omitted and the back surface of the tile may be flat. In this way, the strength of the tile increases. However, a back foot (groove shape) or a dovetail groove may be provided on the back surface of the tile, and in this way, the integrity of the tile and the concrete is further improved.

  The angle of the tapered surface is preferably 3 to 15 °.

  The present invention can be applied not only to the PC plate but also to various PC members.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 is a sectional view of a PC member according to the embodiment, and FIG. 2 is a sectional view of a tile.

  In this embodiment, in order to obtain a PC plate (precast concrete plate), first, as shown in FIG. 1, a plurality of tiles 2, 2, 2 are arranged on the bed 1 at a predetermined interval with the back surface facing upward. A temporary joint material 4 is disposed between the tiles 2 and 2. A PC in which high-fluidity concrete 3 is placed from above the tiles 2, the concrete 3 is integrated with the tiles 2, and a plurality of tiles 2, 2, 2 are integrally attached to the surface of the concrete 3. Get a version.

  On the back surface of each tile 2, dovetail legs 2 a, 2 a, 2 a are formed to protrude by providing dovetail grooves 2 d.

  A tapered surface 2b is formed on the rear edge side of the wooden end surface of each tile 2. The taper surface 2b is formed so as to protrude outward from the vertical end surface 2c extending from the front side of the tile 2 toward the back side of the tile 2, and so as to protrude sideways toward the upper side in FIG.

  In this way, if the tapered surface 2b is formed on a part or the entire periphery of the side surface of each tile 2, the placed concrete 3 goes around to the surface side of the tapered surface 2b and holds the tile 2 firmly. As a result, the tiles 2 are firmly integrated with the concrete 3, and the attached state of the tiles 2 becomes extremely strong, making it difficult for the tiles 2 to peel from the concrete 3.

  Moreover, in this embodiment, since the high fluidity concrete is used as the concrete 3, the concrete is filled in the joint gap sufficiently densely, and the tile 2 is firmly integrated with the concrete 3.

  In order to make the concrete 3 have high fluidity, the water-cement ratio of the concrete is preferably 40% or more, for example, 50 to 60%. The concrete may be a lightweight concrete using a lightweight aggregate.

  The slump height of the concrete 3 is preferably 23 cm or more, for example, about 23 to 25 cm. The slump flow is preferably about 40 to 50 cm.

It is preferable that the bottom surface of the dovetail groove 2d is located on the back surface of the tile with respect to the intersection point P between the tapered surface 2b and the vertical surface 2c, that is, the depth of the back foot is shallower than the thickness of the portion forming the tapered surface. This increases the strength of the tile. In the case the tile thickness _{D 1} of 7-9 mm, it is preferable that the distance d of the tile thickness direction between the bottom surface and the intersection point P of the dovetail 2d is about 1 to 5 mm. The distance W between the dovetail groove 2b and the wood end surface is preferably about 6 to 9 mm. The height of the tapered surface 2b is preferably 4 to 6 mm.

  However, in the present invention, the dovetail 2d is not provided, and the back surface of the tile may be flat. Even in this case, the tile and the concrete can be firmly integrated by the action of the tapered surface 2b.

  The taper angle 2 of the taper surface 2b (the included angle with the extended surface of the vertical surface) is preferably 3 to 15 °, particularly 5 to 13 °. By setting it as this range, the concrete 3 is easy to go around to the joint gap, and the binding force of the tile 2 becomes sufficiently high.

The range _{D 2} providing a tapered surface 2b is preferably 40-70% of the thickness _{D 1} tile 2. Further, the tile back surface may be a normal groove in which the side surface of the groove is substantially perpendicular to the bottom surface instead of the dovetail groove, or may be a flat surface.

Example 1
95 × 45 × 9 mm, no dovetail, taper angle (θ) 7.8 °, taper surface range (D ₂ ) 5.5 mm, 3 tiles with a joint gap of 5 mm, parallel in the short direction A 100 × 100 × 400 mm specimen was manufactured by placing high fluidity concrete with a slump height of 25 cm. This specimen was compressed in the longitudinal direction, and the amount of concrete strain when the tiles were broken or peeled was measured and found to be 1115 μm.

  The concrete slump is 25 cm, the slump flow is 70 cm, the air amount is 3%, the water-cement ratio is 68.8%, and the fine aggregate ratio is 53.3%.

Unit amount of formulation, water 170 kg / ^{m 3,} cement 247kg / ^{m 3,} fine aggregates 838kg / ^{m 3,} coarse aggregate 745kg / ^{m 3,} admixture 272 kg / ^{m 3,} in admixture 7.266kg / ^{m 3} is there.

Comparative Example 1
When the same test was performed except that a tile having no tapered surface was used, the strain was 880 μm.

  From these results, it was recognized that the provision of the tapered surface improved the tile bondability and also improved the in-plane deformation followability.

Example 2 and Comparative Example 2
In Example 1 and Comparative Example 1, concrete was placed by pasting a resin film on the back of the tile. When the peel strength of this tile was measured, it was 1.02 N / mm ² in Example 2, whereas it was 0.75 N / mm ² in Comparative Example 2. Also from this result, the effect by providing the taper surface was recognized.

It is sectional drawing of the PC member which concerns on embodiment. It is sectional drawing of the tile of FIG.

Explanation of symbols

2 tile 2a sole 2b taper surface 2c vertical surface 2d dovetail

Claims (6)

In a PC member in which a plurality of tiles are arranged with joint gaps and concrete is placed on the back side of the tiles,
The tile has a tapered surface in which a rear edge side of a wood end surface projects sideways, and the tapered surface is embedded in high-fluidity concrete. In Claim 1, the back is provided in the back of the tile,
The PC member, wherein the depth of the back foot is shallower than the thickness of the portion forming the tapered surface.   3. The PC member according to claim 1, wherein a taper angle of the tapered surface is 3 to 15 degrees. In the method of manufacturing a PC member having a step of arranging a plurality of tiles with joint gaps and placing concrete on the back side of the tiles,
The rear edge side of the wood end surface of the tile is a tapered surface projecting sideways,
A method for producing a PC member, wherein the concrete is highly fluid concrete.   5. The method for manufacturing a PC member according to claim 4, wherein the concrete has a slump height of 23 cm or more.   6. The method for manufacturing a PC member according to claim 4, wherein the water-cement ratio of the concrete is 40% or more.

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